Forklift Travel Path Access Control With Permission-Based Speed Modes
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Solution Overview
Problem
Existing materials handling vehicles lack effective access control mechanisms for travel paths, leading to congestion and delays, particularly in environments with narrow aisles where multiple vehicles need to access the same path.
Innovation Solution
Implementing a travel system with normal, limp, and restricted modes, and an electronic permission request and response system to manage access to access-controlled travel paths, including buffer areas and resource allocation schemes to optimize vehicle access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple materials handling vehicles are allowed to access the same travel path simultaneously, then vehicle productivity and task completion speed are improved, but path congestion and collision risks increase
Solution Approach 1:
The system performs preliminary actions by sending electronic permission requests to the permission controller before vehicles enter the travel path. The permission controller预先 determines path availability and grants permission in advance, preventing congestion before it occurs rather than reacting to it.
Solution Approach 2:
The permission controller continuously monitors travel path status and provides feedback through electronic permission responses to vehicles. This feedback mechanism allows the system to dynamically adjust vehicle access based on real-time path conditions, preventing congestion while maintaining high productivity.
2Object-affected harmful factors
If access control mechanisms are implemented to manage vehicle entry to travel paths, then path congestion is reduced, but system complexity and response time increase
Solution Approach 1:
The permission controller serves as an intermediary between vehicles and the travel path. It centralizes access control decisions, managing vehicle entry permissions electronically without requiring complex physical barriers or manual intervention, thus reducing overall system complexity while effectively preventing congestion.
Solution Approach 2:
The system replaces mechanical access control methods (such as physical barriers, manual signaling, or interlocks) with electronic communication between vehicles and the permission controller. This substitution reduces mechanical complexity while maintaining effective congestion control through electronic permission granting.
3Reliability
If vehicles must wait for permission before entering travel paths, then collision risks are reduced, but vehicle idle time and operational delays increase
Solution Approach 1:
Vehicles send permission requests in advance before reaching the travel path entry point. The permission controller processes these requests and grants permission beforehand, allowing vehicles to maintain momentum and minimize idle waiting time while still ensuring collision-free access through pre-authorized entry.
Solution Approach 2:
The system maintains continuity of useful action by allowing vehicles to proceed continuously once permission is granted, without requiring repeated stop-start cycles. The electronic permission system enables smooth, continuous vehicle flow through the travel path while preventing collisions, thereby reducing idle time and maintaining operational efficiency.
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
An electronic message indicates that a materials handling vehicle is approaching an access-controlled travel path. The materials handling vehicle has a travel system that includes a normal travel mode, a limp travel mode, and a restricted travel mode. An electronic permission request is generated to enter the access-controlled travel path. Additionally, an electronic command is issued to set the travel system to the limp travel mode as the materials handling vehicle engages an entry threshold of the access-controlled travel path. A transceiver receives an electronic permission response that includes a determination of whether the access-controlled travel path is in an open state or a closed state. An electronic command then sets the travel system to the restricted travel mode when the access-controlled travel path is in the closed state, and the normal travel mode when the access-controlled travel path is in the open state.